There's a lot the average person doesn't know about concrete. For example, it's porous; it's the world's most-used material after water; and, perhaps most fundamentally, it's not cement.
Materials Science
Apr 06, 2020
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185
When it comes to encouraging manufacturers to reduce their carbon dioxide (CO2) emissions, a carrot might be more effective than a stick. That's the approach taken by a recent U.S. tax code rule that offers credits to companies ...
Other
Feb 26, 2020
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8
Researchers have developed a nondestructive and noninvasive optical technique that can determine the setting times for various types of cement paste, which is used to bind new and old concrete surfaces. The new method could ...
Optics & Photonics
Jan 16, 2020
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8
A team of chemists at McMaster University has discovered an innovative way to break down and dissolve the rubber used in automobile tires, a process which could lead to new recycling methods that have so far proven to be ...
Materials Science
Jan 13, 2020
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94
As the most widely used construction material, concrete is indispensable in the development of infrastructure, industry and housing. It's a mixture of aggregates (sand, gravel, crushed stone), water and cement, and whose ...
Materials Science
Dec 19, 2019
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13
Concrete is the most widely used man-made material, commonly used in buildings, roads, bridges and industrial plants. But producing the Portland cement needed to make concrete accounts for 5-8% of all global greenhouse emissions. ...
Materials Science
Nov 19, 2019
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10
A key part of drilling and tapping new oil wells is the use of specialized cements to line the borehole and prevent collapse and leakage of the hole. To keep these cements from hardening too quickly before they penetrate ...
Materials Science
Nov 13, 2019
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11
It's well known that the production of cement—the world's leading construction material—is a major source of greenhouse gas emissions, accounting for about 8 percent of all such releases. If cement production were a country, ...
Materials Science
Sep 17, 2019
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114
Concrete is the most widely used building material in the world. As a key component of concrete, cement—and more specifically its production process—is a significant contributor to climate change. Every year, over 4 billion ...
Materials Science
Sep 16, 2019
1
13
When humans go to the Moon or Mars to stay, they will need to construct safe places in which to live and work. The most widely used building material on Earth, concrete, may be the answer. It is strong and durable enough ...
Space Exploration
Sep 04, 2019
9
356
In the most general sense of the word, a cement is a binder, a substance which sets and hardens independently, and can bind other materials together. The word "cement" traces to the Romans, who used the term "opus caementicium" to describe masonry which resembled concrete and was made from crushed rock with burnt lime as binder. The volcanic ash and pulverized brick additives which were added to the burnt lime to obtain a hydraulic binder were later referred to as cementum, cimentum, cäment and cement. Cements used in construction are characterized as hydraulic or non-hydraulic.
The most important use of cement is the production of mortar and concrete - the bonding of natural or artificial aggregates to form a strong building material which is durable in the face of normal environmental effects.
Cement should not be confused with concrete because the term cement explicitly refers to the dry powder substance. Upon the addition of water and/or additives the cement mixture is referred to as concrete, especially if aggregates have been added.
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